Question

VA ROG URGENT DAU COROANĂ + 50PUNCTE​

Answer 1

(AD) = 360° - (140°+60°+120°) = 40°

(BCD) = 60° + 120° = 180°

(ADC) = 40° + 120° = 160°

(DAB) = 40° + 140° = 180°

(ABC) = 140° + 60° = 200°

∡A = (BCD)/2 = 180°/2 = 90°

∡B = (ADC)/2 = 160°/2 = 80°

∡C = (DAB)/2 = 180°/2 = 90°

∡D = (ABC)/2 = 200°/2 = 100°

∡ADB = (AB)/2 = 140°/2 = 70°

∡BDC = (BC)/2 = 60°/2 = 30°

∡DCA = (AD)/2 = 40°/2 = 20°

∡ACB = (AB)/2 = 140°/2 = 70°

∡CBD = (DC)/2 = 120°/2 = 60°

∡DBA = (AD)/2 = 40°/2 = 20°

∡BAC = (BC)/2 = 60°/2 = 30°

∡CAD = (CD)/2 = 120°/2 = 60°